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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.fd.honeycomb.translate.v3po.util;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.net.InetAddresses;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import javax.annotation.Nonnull;
import org.apache.commons.lang3.StringUtils;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6AddressNoZone;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Prefix;
/**
* Trait providing logic for translation of ipv6-related data
*/
public interface Ipv6Translator extends ByteDataTranslator {
/**
* Transform Ipv6 address to a byte array acceptable by VPP. VPP expects incoming byte array to be in the same order
* as the address.
*
* @return byte array with address bytes
*/
default byte[] ipv6AddressNoZoneToArray(@Nonnull final Ipv6AddressNoZone ipv6Addr) {
byte[] retval = new byte[16];
//splits address and add ommited zeros for easier parsing
List<String> segments = Arrays.asList(ipv6Addr.getValue().split(":"))
.stream()
.map(segment -> StringUtils.repeat('0', 4 - segment.length()) + segment)
.collect(Collectors.toList());
byte index = 0;
for (String segment : segments) {
String firstPart = segment.substring(0, 2);
String secondPart = segment.substring(2);
//first part should be ommited
if ("00".equals(firstPart)) {
index++;
} else {
retval[index++] = ((byte) Short.parseShort(firstPart, 16));
}
retval[index++] = ((byte) Short.parseShort(secondPart, 16));
}
return retval;
}
/**
* Creates address array from address part of {@link Ipv6Prefix}
*/
default byte[] ipv6AddressPrefixToArray(@Nonnull final Ipv6Prefix ipv4Prefix) {
checkNotNull(ipv4Prefix, "Cannot convert null prefix");
return ipv6AddressNoZoneToArray(new Ipv6AddressNoZone(
new Ipv6Address(ipv4Prefix.getValue().substring(0, ipv4Prefix.getValue().indexOf('/')))));
}
/**
* Extracts {@link Ipv6Prefix} prefix
*/
default byte extractPrefix(Ipv6Prefix data) {
checkNotNull(data, "Cannot extract from null");
return Byte.valueOf(data.getValue().substring(data.getValue().indexOf('/') + 1));
}
/**
* Converts byte array to {@link Ipv6Prefix} with specified prefixLength
*/
default Ipv6Prefix arrayToIpv6Prefix(final byte[] address, byte prefixLength) {
Ipv6AddressNoZone addressPart = arrayToIpv6AddressNoZone(address);
return new Ipv6Prefix(addressPart.getValue().concat("/").concat(String.valueOf(prefixLength)));
}
/**
* Parse byte array returned by VPP representing an Ipv6 address. Vpp returns IP byte arrays in reversed order.
*
* @return Ipv46ddressNoZone containing string representation of IPv6 address constructed from submitted bytes. No
* change in order.
*/
@Nonnull
default Ipv6AddressNoZone arrayToIpv6AddressNoZone(@Nonnull byte[] ip) {
checkArgument(ip.length == 16, "Illegal array length");
try {
return new Ipv6AddressNoZone(InetAddresses.toAddrString(InetAddresses.fromLittleEndianByteArray(ip)));
} catch (UnknownHostException e) {
throw new IllegalArgumentException("Unable to parse ipv6", e);
}
}
/**
* Detects whether {@code IpAddress} is ipv6
*/
default boolean isIpv6(IpAddress address) {
checkNotNull(address, "Address cannot be null");
checkState(!(address.getIpv4Address() == null && address.getIpv6Address() == null), "Invalid address");
return address.getIpv6Address() != null;
}
/**
* Parse byte array returned by VPP representing an Ipv6 address. Vpp returns IP byte arrays in natural order.
*
* @return Ipv46ddressNoZone containing string representation of IPv6 address constructed from submitted bytes. No
* change in order.
*/
@Nonnull
default Ipv6AddressNoZone arrayToIpv6AddressNoZoneReversed(@Nonnull byte[] ip) {
checkArgument(ip.length == 16, "Illegal array length");
ip = reverseBytes(ip);
try {
return new Ipv6AddressNoZone(InetAddresses.toAddrString(InetAddresses.fromLittleEndianByteArray(ip)));
} catch (UnknownHostException e) {
throw new IllegalArgumentException("Unable to parse ipv6", e);
}
}
/**
* Detects whether {@code IpPrefix} is ipv6
*/
default boolean isIpv6(IpPrefix address) {
checkNotNull(address, "Address cannot be null");
checkState(!(address.getIpv4Prefix() == null && address.getIpv6Prefix() == null), "Invalid address");
return address.getIpv6Prefix() != null;
}
}
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